I'm not too familiar with lfs in Queens that cater to planted tanks, except for 2, Paradise Aquarium, located in Ridgewood, near Fresh Pond Road. And Aquatic Creations, which is near the Williamsburg section of Brooklyn, but close to Sunnyside Queens.

If you just want any lfs, I'm sure that there are plenty around the neighborhood, just check the Internet Yellow Pages, and do a search.